I'd like to convert the output stage in a PCM1793 based DAC from its current OPA2134 to tube. The Dac uses a differential +- output stage and that's the part I can't find any tube info on. I know I've seen posts on how to replace the differential op-amp section with a tube circuit.

The good stuff begins around Post #81 with a post by Tom S.
I think all the kinks in my version were worked out by Post #90.

Truly a masterpiece of dumb luck. Fantastic PSRR and CMRR.
Seriously, I didn't discover till after the fact that I had pulled
a Broskie and got all the bad stuff to magically cancel out.
Couldn't have designed this good if I was actually trying.

Mind you the power supply is deliberately shown with
absurd amounts of ripple, just to illustrate the rejection.

Originally posted by kkillebrew I'd like to convert the output stage in a PCM1793 based DAC from its current OPA2134 to tube. The Dac uses a differential +- output stage and that's the part I can't find any tube info on. I know I've seen posts on how to replace the differential op-amp section with a tube circuit.